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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb85aaf318d750cf7a9d5e2911e98b07b072d067d14e5e36a45934272ae12d26' 
  AND token = 'fT6AMlg1SpBIMWKl7eoyMjuqMEaTXiv2q1YHKWgKP/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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