SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868a15fb36c45cbb678bdbcb8510ae7520505e86d6233e0a910194f51c4fbdc1' 
  AND token = 'BjAvGUSl/Ilwj0p1b6FEs9ymRX7JRVsCYYPSAC/sjl4=' 
  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