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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ce970a65a1d02103f5fb8d49d84ed19586d70c17d03f5fc9160e00ad0650e4' 
  AND token = 'MDIQJz4G6awutJ5MEZPGQN51ClxB3Luz/FnU2o1P5+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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