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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98946287936a156f1ee8f69ab8681d43dea93b4164b96c5fbc4a024ba12c6dce' 
  AND token = 'C+8klt10NIoLrP8xE6GW9c6u9v39gB1ISn8p75Vc6xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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