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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d6b593be430e5b9f729e0542b5c6f443b5c7dceda28b26b89a78fb62dc43a4' 
  AND token = '6lbjpTsIEWGxXz2q/2GBsQ3G9DqI2MtaGndJNohOeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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