SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c050a33e150bb79469d0c438e86904cb1ff40dc7a486ffc9d8886d6af244d1db' 
  AND token = 'D93Qzn/Jk/FMvsdFj+X8u3QGzKwIuMrmeknUvmZtnFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}