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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ca4e7273c24c047a2e80bb47e3c00b02bfb0e243116874efabc68a8375d5d1' 
  AND token = '4CIdhy8ReRQdZqpLnlUPNWvWvntphRs1EvIj/S0UU0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables