SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85f13909951510d33b64d537fff277eb537968b131689e50ed41fd94bb50d7b' 
  AND token = 'd1kgPDiKMOZkBoqzhqQnaQj58/l497jhZEyDRXafJus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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