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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77ab831fdc29291233cf36d8c736e708daac5069ebea684df13991d5cb9b01a' 
  AND token = 'RTPWb3pZu9xIWQCLUecJSRzT0AK5Om/31qRU+3Ok61M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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