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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ab934bdad16f5d308450e5224359a77c466a8a40d2e5a0b2abb6a800d87d8d' 
  AND token = 'sFwqWcXtJR8B6qVvHhOMQUBPmKKWqAKx35p6Z0ycSEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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