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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e816eb47b3498d677254140826fb7e6ac6d91cd034c5ed3fdb36d2fd191780f' 
  AND token = 'V7zYMO2SLDGQw0oWbBQG1St0tgXe7u4+/G6YgjF/E3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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