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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3117b0ee426d7fc95d8f1f04ea361578bb898e5651dd8f1d6728fca8078fd3ac' 
  AND token = 'aJ5YyxBZNtJVBdTcNAkV7oKMhTvldALiBoxsxPZWsmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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