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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef406bf58cd3122bb7442daee2c0af008f26e4d88895782f15131ee314befa46' 
  AND token = 'iavFkPxP1B3iQHsB6Jpbt+drIODm/ajeXzotXuggI4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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