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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91a9cc560bdddb2d4bedd902948b4bf6ff08b82ca314ddc83f474b101ca23f4' 
  AND token = 'xZlWj78h0piJTiXx4rCd1S8HIxFbIzWkEgBbY0uaWVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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