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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1435923f069ff175bfcd71fc0246db57d745068eaaa953d5240a1681a83bb0' 
  AND token = 'Oilm2eGCUN30VKDNBzMsUntYLnNvpgEUBaNz877VK8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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