Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e002bc20ec5e579281c3a0c92f3271765ad978426a4488a1ebc04db3f9fb3bd' 
  AND token = 'ts3XDvx3+oLp7LEjwZDPP6rL+OTfWQJbWsNqhMwWkrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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