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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49e3a63a900f6dd4979f6a71f993ae314b8c762719280459070eccb30039a20' 
  AND token = '6lOGxxTAP8ysQJKb3jffMU6KsywuystnWfqr6yD6fA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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