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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842acd4115501f14eaa8b17ce5ca0bff19da36a7e6cc6a5cceab19e3f2f1aee2' 
  AND token = '+pIYb9tVcfq0aOKRO1ASzyds09Eq92M0EgN2PSnsXrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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