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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8963d7c1cf01c1ffd46bfedbaf70915c7a276a491f0acb81c9fe26f005f367' 
  AND token = 'skqJUJGF/u2IKTxylNxa11L8HFuhfLuFe3XYf2BdaN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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