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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52608659770616394abfcce065191c0fc1e76fbbdfde02dc4e9fe4865ae48d28' 
  AND token = 'Qkti7nglmmh4fKeockcFLFN61M45t/4oXnSog08TR+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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