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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857a28dd3add4f409f1d33369f062adc296e85494612c5d7e7a0bdaa13d9011d' 
  AND token = 'x24cubrLig2gvrnFYbiB65M4oNiYBKOYMSuMb3gS7C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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