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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c668401d8546a3390af73679960ffcbdfd8f4f8b05f2f5199e4b85dd829257' 
  AND token = '00QyYjIu5qaO/O8inyh+pxDuY2Bj80OF0Wd/sewPtF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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