SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a93f710ac9eed9cdfb6d7499f58c75ced165d5d5d1df0ad948bef88ea22a43' 
  AND token = 'Zy8pYHX4j8zxigvnEXoG8TkNOq1wJxg/OK4NjhtM46Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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