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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbb29c338108a6f0bdaaac475025a1d7c7cccd9a49ada1f8c8b241c6c121e4b' 
  AND token = 'wsZZ/4UyOe1WkVFP35Z2wf4gb93L3pPSRmPN3aCIMvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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