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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9220091b829e5d5b825239bc4ec35b782f0f606300a6c1642fb17f05cce8cc' 
  AND token = 'lTot7qskuIUQVxa3A5QJPDq5DCVaZ6U7yW2LTP8mGSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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