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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dbc6d998b9364d4ee6779d7ea03887f0ea03a972b68b7be7b8d135f428f054' 
  AND token = 'ZQ6S8nYDQ+eo113fcStN5wxBHigjm+PHkzA/WsWvLz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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