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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e0320cb30256bb14bfa89d290b5fc3c5d1b0ff78fa12cc04cddcad145a49bc' 
  AND token = 'onWWgi15t91anEv7hLKDqRL4Rkmwig1yFtv7tef4N2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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