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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6faafdf26fae5177d7b9f40741f6eda37cc34e1f54ca26e54f368451880ef93f' 
  AND token = '8ouDCjH9dt7UkU0S8pcrHvoiEDBanYG/wci+h8NGo7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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