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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89236525debfa8afdb422773fd0aa55c7a96f8a6472f6dfc47e34c71a3b1cdf8' 
  AND token = 'dpgFXq8c1L5cWuOHg+UaI9h2hvQIEQnv9naN8mEGiig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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