Your socks may be too thick, restricting blood flow to your foot in tight boots.
You can get warmers that go over your toes. They are pretty effective actually.
A boot should be snug but not overly tight. As long as it keeps your heel down. You might try some different boots. I am not sure on the Burton Moto, but Burton boots as a rule of thumb break down quite quickly. So if you have had them awhile, it may be time for a new pair.