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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f601dd68a2b8ed2337f86efc5cdb9cf3478bc7b1be907fc9524ccc41bc0b9328' 
  AND token = 'X5rmtti7xYhOWZp1HIFllChXeTIzFUE5sl6x5ZhUh18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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