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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f28bab98171c2308de69aca67db9561447c224f3cb9b7e6b47937bdd83c3c36' 
  AND token = 'igzD30qDatxIthfSea14RIcAtqNK2hf1uDANto6bLpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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