SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80590e938a7ea5925199648cbcd8096bbcec76b0b38a2487e85fa88edff2198d' 
  AND token = 'pwoVB6kLEtCOvHnOLTKz6dNTZYE/iug/GKz7RRg/1uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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