SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3986798efcebb41b86b2ebbb1fcaaed68e8c0bd3e356856e591cb92900ea92d0' 
  AND token = 'iUKaZ1U3294YhzowSDCv7UvzKhPD03SGBPWlVnLq1Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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