SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7206b8ed9038a6aa3943a10c644a561e8cfce22d9a7079aa9c0f2e7e884110' 
  AND token = 'otdGvl35ZPPw/uqjxoAgeDY+OffhDJCYVr9kKN7nFUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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