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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90cffc3d9bd51fe7dacff4f7a04e552db232b5e59e33b82b85b4007402bc868' 
  AND token = '0w+Wlc9/M9GcO5crn2XThCLvAspXQnYRnFJ06faVKaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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