SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63af3bbd95e061ba5b4e72c355a1455581e4dbb08689a033f93718a4ff8b935e' 
  AND token = 'luMPJvG4qvb/10X4VxjHEZA+R8kvu95HWK1kOr+RhwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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