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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b40315e920dd0c9c39538af56b2807439ce1e71073cff5bf93625f8da894c3' 
  AND token = '8dflXd1mdBYMjA/j539cU0aBhsHAI8rjhzyrYpX1YyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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