SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548662015294f73dbaa8afdae52b235f418bdeb1ca59e32a7d4b7aa880d64457' 
  AND token = 'Gvu5x+EyqCfBrPiLiNIU/uJuPeXlFzWyJfKhZ3HuBdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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