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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403049f1d721d092550e8acad66758d45eb60ce3eb5d84cda5f7b7940e9580cc' 
  AND token = '/FUseEULeJ32TD8hxQcw57Qb8LsGDHlTIVlKzcoLZ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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