SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431b59eb7dc6ce2d1215d0f8a1f5de624dbbd04f3589cb5ce47c2253e83225ed' 
  AND token = 'hii+LYCfcrEGsSBdpq3mTEB0ODBRXqCB3/ZKgDhz6iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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