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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c282b517d37a5e391ab35b56e7a85eee7915310f8eaeddc2405eee367509934' 
  AND token = 'f/1Vw25PQSaOOovffBAcYAay9KaZHlRJ12BzS/w9Eec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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