SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e569328b40d6e73fad5cf2b535402a72c083fca798e37bb10021260c7251fa' 
  AND token = 'Xm+KJzWdxWfJbytxB6v0xyWCOwSuOxsKCmvjXRzZnnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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