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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e38bf8f747fa8d4f589a2cea0bd8fbc1479a8bdc1c7e16b7bc0494a4755edc' 
  AND token = 'pYrwHnQefN7dNXbNJu3SLnGMGYt1G4T50tU0EGFlOls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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