SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55855215c9322432fb2f0edec60563fc2d25912a76b8066b44db072e370c9a66' 
  AND token = 'bJ/GpQ+pC/ixRPLU/ww3N/LrhJ8FOkXcROC64LVShSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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