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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00033ec8c93a1a83336f2078a92a702333f39795d367fde6967662c277c2f4f' 
  AND token = 'TjWFhmylhHW1P85AY/4aGcEjuuAkXLDpGN9gFu2xybw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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