SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7236ce7bb6f25824abd86fb49e9d8b916a388b8a2403c5b01923bdbdc77641ae' 
  AND token = 'vgoygkjRCv5KF50V7lucIm4qFJoKo9KfRBQM+dpGQl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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