SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72423859a95ff556da066fa536acf6be751544e1140d9cfadba2cebddfd74e91' 
  AND token = 'Yw8x104KYioHcOgb88qeJoLih1+/lxs7+9gpiwZiJGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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