SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e040c31a4ac126575d5067385fd9e1549e540ff69b3b25fd1cc635960553809b' 
  AND token = 'tTFmxy+/y4r/pawY8f+p88b10WarQRKO34X9gNBYh0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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