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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7784b96244980fd78e82f5162891016d31e0c2cc1b60456aa2aeed62d2cf43' 
  AND token = 'P8dGNOMlD1O0TaopNPbane8gpGKJ2ZowcRJqGiODzVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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