Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2f122087f7144b5499287160fcd4d0aa47ee525741fbb966aba39754aae4f1' 
  AND token = '+mm4noJV6RMZTvaN46iPJCRfZKW/RLmJmH7+wgPlEWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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