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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79ed9c8eecfa97f4ed3002a864d1cbaa631a766b6498cf52f5b616bd64a24d8' 
  AND token = 'dxpOKvwL98odF4/6mAbXt0iRf5JhfhB8LyrunfS2Oy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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