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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e4010662ab7200f2fd7d01c7c761dd464db4f657d937e00a341037344ba13d' 
  AND token = 'XPdZLjKwxwjZ7sD8NeUS2Rjn6TZ0x8viZ0S23oVYrto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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