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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c942706c2e54964a278f5b75f0acf6e99e8717fc44177800a46cc0c76d564d' 
  AND token = 'aY1tp+OvTRstKlNjXAbQp4uw9V9QNtv4kh3WjlHQ+MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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