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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ab570860209c3b75a807000cd1c7b7de67382c45aaca6c2d5b56d6f62834cf' 
  AND token = '3G1M1h908EpYOQ4EDw3KgFhCBU4O9TdWztabb9zv5Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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