SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9052013d307d95670e2d956729db79038e882561f4b599b827f0b2232da46198' 
  AND token = '+L03GaP9D3c2A045DhCgjdyWw+bEJNB6XHwYnvi/UZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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