SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdebeb2fd390b3c8f4c2b305d92a564bf4d73ec9847123fe50f18d8cd596874' 
  AND token = 'J5CSBCVpizQRGfbL6OKKYX8DMkKgGpwQtA1nHRz55JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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