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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb1d6b516639c7e3634d182ea7b7714162bf0872f48ba262707ccd06b8ad1ac' 
  AND token = 'm6cgK5IVInMqaSkG/A5k37Omkxc9U/6zV+RNiA+4K60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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