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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361a5161418f906e31f6eb50135fa33a394cf9564bc88070eaf27520d6b24a3f' 
  AND token = 'tNzddsk1q4gnoRxylzJzLtaDbVTr3xFjPWNRbrMPLjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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