SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c228275a099a961bad1f19bf73c29d75c396d224eb2a7f73d1818de43509880' 
  AND token = '59y+zW0JzVbdH0mianhzuq/J+QrWqYZBrh0pfR3H6nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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