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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77546111e45a8e242df8562266d4844f10409da73901c5b0ea5848b92b06a635' 
  AND token = '3h3Pg1IEBZWAEdHl5MB9lF0KZsM9IiIWlmX40CSHPJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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