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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a7c2984560f35e9c9c30985610959157218f3b96d22bf5d03ff3b9fa30827c' 
  AND token = 'sq4EhA9NywoCGio7w28V5i6kzdPdFRYZt8QcsdroSzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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