Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8632e84cd73b0e28566cb917f708213d93fe1290d864861df4b6bcc7e71a6dc' 
  AND token = 'xoTfREyVZDdhDuZ0G+rO1B+fOCC5ByhgeoyT/NGzKnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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