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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41867ff102f004b07f0e8eec9ceb182c85241c74f5a34be5834bd76e78823c4a' 
  AND token = 'c6KtfT2XYcn5uVrdRBeqPadxJVSI6bN9Fik0DSlXV6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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