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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cc539b6e8485bdf10a307596ead74ee297512c26a91b3d0f763749fb10b7f2' 
  AND token = 'oX079stwGeOiRPgND5gScHZsZQ9JqxjUx0WBxS0c1E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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