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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9acf41c4f4d0473459bfb71886fabb1c6996215c132377aef52b9198ae3878e' 
  AND token = 'il7EaDIPQvd1sBXz7Vvbr1d34/Ckg064shS4/hiNHcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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