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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b5e576111ee30323783768394d7671f6900a23599b689ba57c6c59eaa62218' 
  AND token = 'lRKcUr6oucUyerJ+ZliFy8jc2QQmyJPGorgX2rRm0i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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