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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0c843db49036f2f576c91c3ea8f0dcc41ce2cd73eb8dcb18890db85be1877e' 
  AND token = '32yBnzVZ4UcVLjrY0WdmPyse+kGWbD9H27BwhUDNHDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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