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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8133937a4b184fe7e03d2d5482b8793970605872381c9d7ceb656fded7f4f4' 
  AND token = 'm+o4rSTfbsCfzrjQu29yECXMB+WzdImcTvZy8jJnjxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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