The best and easiest way to scale pixel art without losing quality for me is with paint. Photoshop blurs pixel art when you resize it (maybe you can turn this off?)
Just paste your sprite into paint go to Image > Resize by Percentage and then change from 100% to 50% or whatever you need. You will have to edit out the background colour to make it transparent but that's not too much work
edit: this was already answered but meh