SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af24f472f3a106478f6ab5ae48bbd584383f916711b831dd7db557b06389939c' 
  AND token = 'zpA+fHaLqgzgVKXGI/F9V5X7dTo3jc8QQ77hNsYjAkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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