SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be69a4e8424dc07117271862a686791b374ad87ffb0633359d91b06db9b4d3b' 
  AND token = 'JOXHqvTTcvt5GOzP3Vy4HcSS4hwjnPwzL7GFnQp/BYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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