Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fa3927af9c3dba71a061280f122b19f1e1fffb5a8b2fe98169747f846fe396' 
  AND token = 'ugoLqlzyVRfmIrzE66lnaTrUR4ugYBbv0KpUsFylxdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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