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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4d767fc632d21e0979bd99356051fbc54fafae50be41c36ff2231f0ed99516' 
  AND token = 'jFFAKuQ3Ja7WOsKB4bgFs1DDhMGkjtMFE8bzCEAJU1I=' 
  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