The answer, surprisingly, is no it was not.

The only reason Gallifrey was timelocked was to prevent Rassilon from initiating the Ultimate Sanction which would wipe out all life in the universe and cause an ascension of the Time Lords to be beings of pure cognizance rather than organic life as well as destroy Time itself.

The Eighth (or possibly Ninth) Doctor's use of The Moment timelocked all of the other Time Lords (bar the Doctor, and the Master who ran away from the war out of fear and the drumbeat in his head), the Daleks, the horrors unleashed by both sides such as Nightmare Child, as well as Gallifrey where the Ultimate Sanction was located.

Skaro had already become a wasteland at this point and was the Dalek capital in name only. Thus the Doctor had no reason to time lock it. They primarily used their spaceships to move around and congregate, which is shown in The Stolen Earth and Journey's End and again in Asylum of the Daleks. Though the Parliment ship is either a new canon, or a retcon as Daleks are supposed to only answer to the Supreme Dalek/Emperor Dalek rather than debate in Parliament.