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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f807344fd4ec7743378b55b6fe9f708c2f059889bccd97da9b52d1d0650e5c0' 
  AND token = 'pJyWqssKa6vpt0L8T8inxAsjJ/UIlRf4InqYpMmStBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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