SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f42f7f14ae5c7037d0f52c182c0e3bb2784267361fb8f3d5d12f4107b2b8e2' 
  AND token = 'WIGxZA59mgvMg9lQWRRBAyUChJexPpiS+K8vQudTIk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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