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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdf017bb515c7dfee99cbae66378c23ab8daf011b3f2f09b4bdea292f0b08e7' 
  AND token = 'i2NK/KHLks/Ju5ZaumOUwIfVbexx/av4T0gI1I4Bxyw=' 
  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