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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd55a738f6f8831395de4fab578915d48209dbeba86323b207e21e7c6a811270' 
  AND token = 'jyOTkrMNWveBTfek2D33tGKwBPnzu/DVRv2qB8OTFMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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