SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464e996fff0810dc616c905f510fd0b713d2e309bc473740ff24f0d464937bec' 
  AND token = 'Jws2r2jKEnGVvy9Op9W8YqV2lLl3BXPKRGrOtBgdgEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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