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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e98683e1ffb5e77614f67c52bcb6ec5be517cb8a5b2610ceb2eb6b9d41f4c6' 
  AND token = '57LfVUwqd1mJFMoMzxsS61KwheRs2Fc224CqHA3F5Cw=' 
  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