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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d0d28bc8cfd44810cc42d8196056ee07226ccaa32dcfc03f1c433394da1c72' 
  AND token = 'KqUr4vqxfwgkPlf9Iw8y2bJzO2yDThO1ZHh2BFqJVyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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