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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875f92d9a22b30104942ce2d3b31feb03fca91ca9cc1e726650cf76834ec1166' 
  AND token = 'LUpX/UGslGOxBrbddh5sVschBk1HkuiGfoSzD3odx0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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