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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9a331c4fbe639f5dca68e0d0060f9c2ef2024ddb52d0d797eb23f8509c77c6' 
  AND token = '2AC0aKGz6i/VWOckgmieK4yq5ZglGyoHEoB4Wy5mK5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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