SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d5080d0e60dcb2f646c938e1d198435e469856e61b3cc399f7fc99fe44d85b' 
  AND token = 'shj3o+Y2zIQggSy0L33j+Frh/vzNyjKWba1WiQq6eYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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