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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddd39b8fb3512ec0a7df1a7e24d9b8da1536263e98478ae283dd90b1728b925' 
  AND token = '8RGo6UiNJKtigLUvSz8m5xJjyOSkGRzvcrE573SXMVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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