SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06814d07d35085d7f7c9add38376f7947c3a1066d759b1ceb6b89c2e5a011766' 
  AND token = 'i0zDyWNRDKUKSogSxbTxqpLHDE1w+wIPYQoqJz/Y7ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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