Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6c8d52654915bb862f651946ee26fee16247b6ce545719dde5e5b0d5b4beee' 
  AND token = 'YhMRzQf5Sc5v15J3jLpQcA9N2NfHKAGOSXnJAMFmUO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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