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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7231562d268bbc682a06bda4b8707e1cbb93c7d3dcb9a8197ad47006390b7185' 
  AND token = 'MjN6vPBBGfG6iIMexH8WX8FnP8mOQMrPy0WLqv/DzXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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