Jamieson, Fausset and Brown on 1 John 3:22

22. we receive--as a matter of fact, according to His promise. Believers, as such, ask only what is in accordance with God's will; or if they ask what God wills not, they bow their will to God's will, and so God grants them either their request, or something better than it.

because we keep his commandments--Compare Psa 66:18; 34:15; 145:18, 19. Not as though our merits earned a hearing for our prayers, but when we are believers in Christ, all our works of faith being the fruit of His Spirit in us, are "pleasing in God's sight"; and our prayers being the voice of the same Spirit of God in us, naturally and necessarily are answered by Him.