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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f871a866a3856930a1cb943dbc5a532a0befce0456869fa51e4873185b4cb39' 
  AND token = '5RqItuNgyKgoROjA6wK7cFzBVEF7va3A0uVu+VGUr8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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