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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033ed7afca3d9f214be33c5b9966707a6250db929c560887794b11d8892082a9' 
  AND token = '/n+CWsLoIA2yQrDcEfxo0lXu3AIevTTyVKWgsVVdx9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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