Yes, you can use your Elements for commercial purposes, unless they are marked with "Editorial-Use Only" license.
Editorial-Use Only Elements will be clearly marked with a Royalty Free (Editorial Use Only) tag under its licensing specification on the Element page.
We've summarized the main ideas in this Royalty Free License article.
If you're still unsure about the allowable use of the Element, do drop us an email at sales@motionelements.com and we'll be glad to clarify that for you.