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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7f9263fd772e7e937e55ec05d1038720e63d41b85b4ab74da924435fe28e44' 
  AND token = 'ZJKWRkHLrMTsuYBdI0vXOz5FEKI12x00+eXQ9jOCkWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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