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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a347b4d6cefec4d2f1015fc78eaa75f327742a6a126ae4f1b391dc5cf29454' 
  AND token = 'J+7lUlpNhYsibC8fAxt+FXkqiGKlbHXST75NOXkjOYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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