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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a3fdb91855b0e1537ff0d9cbb1e0b0c3db41933e7b56388f02128eb086a0fd' 
  AND token = '4koXLoJBnbaEgisl1VLLKkxvIWh7mBnOZHqfmbM7hps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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