Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2931869c23939e1701f5d512195fbceed3325ee9e55e0584726ddb941b024a9a' 
  AND token = 'VJ8seQYwl9/MooAFc+fGLLovVk0FtbQBrNaCEBqFlh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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