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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4ddb535601157a14ade11cee06586dc620bf8b557f430715dd39ee1fb0c023' 
  AND token = 'ncvXj1nySbHzRP7WrkgvuI9evl0nCrAnwoYoUSlbycc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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