SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d176882c70c82c0afa2e126e15603bf408bb97498f29607483db3574db3f2d4' 
  AND token = 'ynplroR1YCCV1XrlybzTKGFZvlJLfP3DhgW3bq1lenM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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