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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4155aa02a17ce40422eef92bb3a6d754ecd35ae5fc1774bcc1debd3b73baece7' 
  AND token = 'WnP8IwJcQThOLElo+ykmBYCMC2lhg2a7ZOf65wFjnvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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