Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3a2512415def00476319bbfbddeb05c743dbc729688ac41ebb5cb1a76fba42' 
  AND token = '1hLEgL/Cd9JQeAImpb+yHaoBhPqhtSfMeXm7wSDU25E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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