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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266e9f7e78824b566f8f8241c7fce52adb552be7ff4d48be8aa88de6ec8e1341' 
  AND token = 'lLh09HKUoUMP/l+BaeW8g0kYhCVGR303kgWgM/nATRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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