SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9179014ebfd8a4163d8a56f2d09e0c7eb35a20fcffe8ed9fc2a84ca513e4cd' 
  AND token = 'J9U/PGmwHSXLgQ1YHZcuqTVraXsBV9gYC6abQvNyoMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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