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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7609a085b0e470153cd43144de70cd73f71fec2aed5ece7d742b640b7f6cc3' 
  AND token = 'fDJaOa3J8sAjj55Kr1a9OKN5oPeqSdZXtvoHhbdGyAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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