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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc81b15341bd9573770d72f983617a08d386760a4a3e5c8b04ac74c7d071478' 
  AND token = 'dc5FzN3ww9H0w6HynPMOA/4vj0rQz3XGey71ZOiDG+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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