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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9e119de3efb83205ef5e65a9ad43a02e0f359c53702bfe0e3f57b4a601560f' 
  AND token = '71pYh2wrk9kfUuwbCkB3I1ZJl2B9D1fVQjbqFMcCI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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