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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0944be3acf77353892a61c25b1d003dee24efa8777df785595b6cde29ce737' 
  AND token = '4C2spsrqGpRsk9wtvJNQHuMGPJim5Zv62JgQdUiNMVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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