SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4a43753c4e5f8a2496a955c91c19f135581a5df2034057e13837082b35bc44' 
  AND token = 'h+j6ILYooqw0m1WV2AHRv/ZxNuNN7goNsQYrrHqoZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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