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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566f0f74d57867def2b36f50c0ffc032556a5950428c71995458612a1d11fe08' 
  AND token = 'hZgaOVl6SWBX6LytoakmgG5+lXpVc5U7xjHFs26TtUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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