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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8900813fc5d1827ef77699ff73c84719d1edae7fce969ad0005ebdc7e4d31bc' 
  AND token = 'UJlVUKuk9SGL19TsJBGhisFhFP7v7LomgmNR/SNfAvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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