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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e562752bf521abc535a1ecd53b3f31794bbf405f6a787cb19032b3dbcbab4a72' 
  AND token = '2h6IgyGjvYJ5/9Wvtbz6TUYiuN4OvybV73u9Ui+RiCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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