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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9586353fdde3503fb3ddbd16350909c936d4197f33a98ea40314d78b00ee9a3' 
  AND token = 'y75awt5EitBfbO6qHwOO7UVpfdWl42tN089YrEdkI2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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