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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388f3163e5a8fac3e3c6becec81e97a5b9d8ee658204faba3ba3612e99379ac4' 
  AND token = 'X5+7w8Xt8rZaJ+erv0RuUMTunOkn02idPVOGofzef2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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