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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba3688a4c2622b3d30851b7b08b9f5dbd0f24c6a25eab707b6390df9c7a75c9' 
  AND token = 'mA1hd5rxTRpAJ2lQBwmV38bYdmymDVl1SVIalZ/XCE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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