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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fecf57f79a34a26143d994357270ddf4e35810e9de00bb5074ba9ef2cbdfe04' 
  AND token = 'lwo5BMuLH2/pwGQtqWuefujPx6mgt0Xa2j1mGZ1a/8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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