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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b07ffebb57bdc4468b00c6adbba68817c6e7f91670c582cc21ccdea2aced3f' 
  AND token = 'GNIOFSg63LxrCJAuqd+Qh5pa6Ow57/oAy3PXIU6np3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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