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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2911fcf649c37c28f951a7fa7fe7f4dd3bc457f248c28a2773fdba1d1f3d8f' 
  AND token = 'swgIMevsjTVwOApSOJKeOFIMSdB3fE6K/0dMEX0pzpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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