SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f76ce5845ed433945381ac71fa1b37d0412b885c9d04bb60f7103f29753544c' 
  AND token = '6WvuVv82TGiUNbHGCH+DGIV02lBblO4/VsYlhUF7B5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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