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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907af021c684134fad936934dfec90a1be98dbb165c8c33872b745747a4f140f' 
  AND token = '9hDx8IA3A4kcR6aLgqNK9Kbm71Njetz0XwWQnkNPT8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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