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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e551eb0f8a4efca797d11be092567ef665b9b01f3e4ac89dbe24a3ee17b904' 
  AND token = 'yifTEAFHbKgdpQLPz2JGChcyZZjKQ36ZmO1chPhmEHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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