SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd230e1e98ca8845147d581ba93e7f2fe138bf3ba9313f75a842a783c44b54f4b' 
  AND token = 'Bfvq05ShBXjz5ZlUF0viD0Kzfx9YAzFHHmzUICVsooU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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