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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728c35edf62a4c1d2c9809a220554d58c7e10c179074bd24b24313fb11e3e5af' 
  AND token = 'aFl1pA4yeoa2wpOcMokbwj4AdMUp/Xpz/P34F1RMqHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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