SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2e12ee88a35e8e10be31459af45a94d3f3dff40504b1715a645d99a60e68c8' 
  AND token = 'VluDSjBUK2KtEqj9xbD9+uSIGhK+O9Q4wznj8VZnrx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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