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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3409602b2159115aa3856541878b55d183291cb1b6dda1b81ea1e552f254ea7d' 
  AND token = '56AxjEu8r+4AzpQTKvj4xPtZb12rwuc65UGgLeOZvkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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