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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8fe464717e6216e5dbb1d579e2e84befc0c677e456be9dd7d72a6ad5bd02da' 
  AND token = 'i6dLkfInOHqysH03UAqzzp9yxEhJk84oX7OstxJMNdg=' 
  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