SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf555bd3e24acf0c855f6bad662c3fad822f52f7457bcfb09fc43e3cd708a2f8' 
  AND token = 'YWp/ssrvHuX/7DwLOfV5elFSI+GdpKBYH1BXULu4Yow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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