SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4caee9c66290857a340d82e92d4b327046f9fd64d8237a8fa7138c0763a32d63' 
  AND token = 'IPCjiwvOQH93gSJjHMEgmrpiuKwmVes1Pq+26tCVlp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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