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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd029d0b7cf8b01a8de3c14637ee79623eae5c71d8ccb313f65a5d27a129c87' 
  AND token = '8aFWlAvyZmTRsdA9Iq2Z3DEktRS1AsWoqHA8Z7hePWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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