SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443d5908a9afbc74d8ee795e31d701c6a8ff060841d54cd714cc20305b5c690f' 
  AND token = 'Lahz+VBHrDXj6b4Jy53A8qgUG7dpqL4scMJw1WdbPvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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