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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70588d961b224cb44065f6a612345798a661b61cc0d2abb0dc56b541a4811834' 
  AND token = '/4MTDmI8kgIrAyxjjVReUkampzF9V5Ey9Y1d7VzL0K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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