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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65157ea6f661f7d88934cc641c5028c2ed0e5caa68f93b55a7ee42428d002aca' 
  AND token = 'KXrj781wzXiOiMnk2uc+vv4Vi1Vw+Kfx6YnG30svscw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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