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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ac91860fd0309d7c3e5c0f1daac2437a122075bb65725cad39203913a26a21' 
  AND token = 'H0ETvKw+chbzhAkP8dsv9LBD83CwrRyIWCCLqfIPhMk=' 
  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