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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd648829a7bb8df3e212b603044c14e4a8820ea191131e735fd08aa92535871' 
  AND token = 'awu0C9Y2fe9/lp+x3cjTS8T5oWFm/0ahK70wGUMxqVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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