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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c6c9b040447de2e2aaba950daec787a66216b0f648d7f6c22815440809e422' 
  AND token = 'WuTs/TttLnY1X+X8UcnrZutxw37XtWS1e5POK/nBYdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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