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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9f540d095ff7e4fc545f9a3566f188bb55d72aa2b3469afae1d138d059154d' 
  AND token = 'L172kEoddJcyQw3QV54SxOPuvoHsgJo62a8D0je9rJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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