SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67efec7f8422ab72fed4f9a7651f5e9ee49ff3a8ef26175953751fdbc6ac8e3b' 
  AND token = 'RiGpIfWjJw9ZgzmlKNWJXBVcnXVrmkdaqjuOZapKX6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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